Tool-holding means



June 25, 1940. J. 'r. Hxscocx 2,205,955

Toon nomme mms Filed June 24, 1959 .9 54 59 4 @gli Patented June 25,1940 UNITED STATES PATENT oFFlCE e f claims.

My invention relates generally to tool-holding means, but moreparticularly to vtool-holding means such as for example as are used inconnection with lathes, planers, or Shapers, and commonly involving anelement thereof, a tool post.

While my invention has utility in a considerable number of situations, Ihave devised it for use more particularly in connection with toolholdingmeans such as are shown in my pending application for United StatesLetters Patent, Serial No. 192,636, led February 25, 1938.

In those cases where the tool post supports a part, such as a bar-likemember, extending at an angle therefrom, and on this bar ls supported,as by a fixture7 a bar or rod arranged alongside of the bar-like memberand extending at its opposite end beyond the fixture with a cuttingportion on one end as for example as shown in my said pendingapplication. it has been found, in practice, that under certainconditions the bar or rod, as provided, is subjected to objectionablevibration or chatter in the work-cutting operation.

One of my objects is to prevent such chatter or vibration and toaccomplish this by a simple and economical form of means.

Where such structures involve the feature of the bar or rod which isheld by the fixture, being rotatably supported on the bar-like member,itis desirable not only to provide means which will prevent thevibrating or chattering .of the rod or bar but also to provide for thefunctioning of such means in the different positions of rotatableadjustment of the rod or bar and by a simple construction and onerequiring the minimum of manipulations for the different adjustments.

It is, therefore, another object of my invention to provide the meanswhich prevent chattering or vibration of such construction that itwillbe adapted for use where the fixture, carrying the bar or rod, isrotatably adjustable on the bar-like member and which will be of simpleconstruction and require the minimum number of manipulations tocondition it for use in the dierent rotatable adjustments referred to.

Still other objects will be manifest from the following description.

Referring to the accompanying drawing in which I have illustrated myinvention as applied to the structure illustrated in my said pendingapplication:

Figure 1 is a plan view of tool-holding means embodying my invention,showing one form in which my improvement may be embodied;

Figure 2 is a view in side elevation of the tool equipped rod or bar ofthe construction;

Figure 3 is a section, taken at the line 3 on FigureV 1 and viewed inthe direction of the arrow;

Figure 4 is a plan sectional view, taken at the line 4 on Figure 3 andviewed in the direction of the arrow;

Figure 5 is a fragmentary sectional View, taken at the une 5 on Figure 1and viewed in the direc- 10 tion of the arrow;

Figure 6 is a view,taken at the line 6 on Figure 1 and viewed in thedirection of the arrow;

Figure 7 is a fragmentary plan View of a portion of the structure ofFigure 1' showing another 15 embodiment of my invention; and

Figure 8 is an end view of the structure ofFigure 7, the structure beingviewed from the right hand side of this gure.

Referring to the construction shown in Figures ,20 1-6, inclusive; itcomprises a supporting member 9 of bar-like form, the main body of whichis in the form of a flat bar I0, and the end thereof, shown as adaptedto receive a tool as hereinafter described, of cylindrical `form, asrepresented 25 at II.

The member 9 is adapted to be positioned at its bar portion I0 in the`opening in a tool post I2, as commonly provided, as for example inlatl'es, the member 9 being secured to the post, as for 30 example by aset screw I3.

In the construction shown, the outer end of the member 9 is adapted tosupport a tool, such as that shown at I4, for cutting the work, indiierent positions of adjustment. To this end the outer 35 end of themember 9 is recessed to receive the tool between spaced apart stops I5andy I6, these stops being suiiiciently spaced apart to permitA the toolto be swung from a position in which it extends parallel with the memberinto any se- 40 lected position on this member either to the right or tothe left within the limits of the stops I5 and I6. A set screw I1, inthe member 9 and screwing in a boss I8 thereon and against the tool l'holds the tool in adjusted position.

The construction shown also comprises a toolholding attachment orfixture, represented generally at I9, and comprising a head structure 20having two parallel cylindrical openings 2| and 22 extending entirelytherethrough. The walls of these openings are split, as represented at23 and 24, respectively, to form means at which the fixture may beclamped to the cylindrical part II of the bar-like member 9, and mount amember, hereinafter referred to, having a cuttingportion.

The clamping means for the opening 2l comprise a clamp screw whichextends through the body of the metal at one side of the slit 23 andscrews into the body of the metal at the opposite side of this slit; theclamp for the opening 22 comprising a clamping screw 25 similarlypositioned.

The fixture is shown as secured to the cylindrical bar Il of the member9 to be adjustable thereon into any desired position of angularadjustment about the longitudinal axis of the member 9. The member 9includes the projecting boss ill, desirable especially to reduce theweight of the tool holder and still afford the desired depth of metal atthe threaded connection between it and the set screw I'I, the inner wallof the opening 2l containing a groove 21 extending lengthwise thereoffrom its right hand end to a point short of its opposite end, thisgroove opening into an annular groove 29. Thus in applying the fixtureI9 to the member 9, it is slid at its groove 2! along the boss I9 untilthe annular grove 29 registers with this boss, whereupon the `fixturemay be freely rotated upon the memberS into any desired position ofangular adjustment, the interlock between the wall of the groove 28 andthe boss I8 preventing accidental separation of the fixture and member 9in practically all positions of angular adjustment of the fixture on themember 9.

The cutting-portion equipped member, which is to be held in the opening22 in the fixture I9 to extend alongside of the member 9, `may be of anydesirable form. It may be in the form of a rod or bar 29, preferablyangularly adjustable and longitudinally adjustable in the xture I9 andhaving any desired form of cutting-portion.

The cutting-portion equipped member 29 may be, by way of example, aboring tool (not shown) for boring into the end of work held only by achuck at its opposite end; or it may be of the general type used inlathes, as shown, the tool proper represented at 39, being shown assupported in a holder rod or bar 3l, secured inthe opening 22 in anydesired position of angular and longitudinal adjustment therein; theterminal end of the bar 3! conforming in construction to the terminalend of the bar 9 and providing stop means 32 and 33 for cooperation withthe tool l3l), in the different angular positions of the latter as abovedescribed, this construction, however, not employing any boss, such asshown at I9, at the place where the set screw for holding the toolmember 39 in adjusted position is provided.

As will be understood from the foregoing, the provision of the xture I9,as shown and described, permits it to be angularly adjusted about theaxis of the member 9 on which it is supported, to any desired position,and permits of the securing of a tool in the fixture in any desiredposition of angular adjustment about the axis oi the opening 22,`thereby providing for the adjustment of the tool into any desiredposition for accomplishing the desired cutting of the work.

The fixture I9 is relatively short compared to the length of the member29, whereby this member projects at its opposite ends beyond the nxture,and because of such protrusion of the member beyond the fixture, thismember is subject to chattering or vibration in the cutting operation.

I have found that such chattering or vibration may be prevented andimproved work produced by rigidly connecting the rear end of the member29 with the bar-like member 9.

Two forms of construction of means for this purpose are shown: inaccordance with the showing in Figures 1-6, inclusive, these meanscomprise a bridging, or connecting, block 34 extending transversely ofthe members 9 and 29, one end of the block having a notch 35 with asemicylindrical end wall 36 at which the block straddles a clamp screw31, screwed into the rear end of the member 9. The block 34 is thusadapted t0 be rotatably adjustable on the screw 31 when the latter isloosened and rigidly clamped by the head of the screw to the member 9upon tightening the screw. The other end of the block 3d contains acylindrical opening 98 containing a longitudinally split bushing 39through which the cylindrical member 29 extends. The wall of the opening98 is split, as shown at 49, and pressure for rigidly clamping the block3d to the member 29 is exerted by means of a clamp screw M extendingthrough a smooth bore opening 92 in the block at one side of the joint40 and screwing into a threaded opening 43 in the block at the otherside of the joint.

Figures 7 and 8 illustrate a modified form of block for rigidlyconnecting the rear end of the member 29 to the member 9. In this formof construction the block, shown generally at M, comprises two sepa-ratesimilar clamp sections 45 and I6 having opposed sets of recesses 4T, d8,49, and 59 at the joint between these sections; one set being providedto receive a cylindrical stud 5I on the rear end of the member 9, andthe other im set to` receive the member 29, a clamp screw 52 beingprovided to tightly draw the sections 45 and 49 together about the stud5I and the member 29 and rigidly connect them together. In

this construction it is necessaryto loosen and then tighten a singlescrew only in the adjusting of the member 29 and the reclarnping thereofin adjusted position.

As will be understood, the blocks, as described,

are readily adapted for the angular adjustment of the member 29 aboutthe member 9 upon the loosening of the clamp screw 3l in the case of theconstruction shown in Figures 1-6, and the angular adjustment of themember 29 about its longitudinal axis and longitudinal adjustment of wthis member in the iixture I9 upon unloosening the clamp screw fil, inthe case of this construction; and in the case of the construction shownin Figures '7 and 8, by merely loosening the single clamp screw 52.Figures l-6 and the clamp screw of Figures 'I and 8 are tightened, theblocks are caused to serve as means for rigidly connecting the members 9and 29 together preventing vibration or chattering of the member 29.

While I have illustrated and described certain embodiments of myinvention, I do not wish to be understood intending to limit theinvention When the clamp screws of s thereto, as thesame may bevariously modified and altered and the invention embodied in other formsof structure, without departing from the spirit of the invention.

I claim:

l. Tool-holding means comprising an element, means for holding saidelement in projecting position on a tool post, a structure extending atone side o said element and having a part between. its ends at which itis connected with said element, a cutting-portion at one end and aprojecting portion at its opposite end extending alongside of saidelement, and means engaging said element and said projecting portion forrigidly holding said projecting portion to prevent vibration of thelatter.

2. Tool-holding means comprising an element, means for holding saidelement in projecting position on a tool post, a tool xture connectedwith said element, a bar carried by said fixture and extending alongsideof said element and at one end having a cutting-portion, its oppositeend projecting beyond said fixture, and means engaging said element andsaid bar for rigidly holding said bar to prevent vibration of thelatter.

3. Tool-holding mea-ns comprising an element, means for holding saidelement in projecting position on a tool post, a structure extending vatone side of l said element and rotatably adjustable about said element,said structure having a part between its ends at which it is connectedwith said element, a cutting-portion at one end and a projecting portionat its opposite end extending alongside of said element, and meansengaging said element and said projecting portion forr rigidly holdingsaid projecting portion to prevent vibration of the latter, said meansbeing rotatably a-djustable about said element.

4. Tool-holding means comprising an element, means for holding saidelement in projecting position on a tool post, a structure extending atone side of said element and having a part between its ends at which itis connected with said element, a cutting-portion at one end and aprojecting portion at its opposite end extending alongside of saidelement, and a rigid connecting member having openings therethrough intoone of which said projecting portion extends, and clamp devices, one ofwhich extends through the other of said openings, for rigidly securingsaid member to said element and to said projecting portion.

5. Tool-holding means comprising an element, means for holding saidelement in projecting position on a tool post, a structure extending atone side of said element and having a part between its ends at which itis connected with said element, a cutting-portion a one end and aprojecting portion at its opposite end extending alongside of saidelement, and a rigid connecting member having a recess opening throughan kedge of said member and an opening having a split Wall, saidprojecting portion extending into said opening, and clamp devices forrigidly clamping said member against said element and clamping saidmember to said projecting portion, one of said clamp -devices extendinginto said recess and adapted whenL loosened to permit said member toswing thereon.

6. Tool-holding means comprising an element, means for holding saidelement in projecting position on a tool post, a structure extending atone side of said element and having a part between its ends at Whichitis connected with said element, a cutting-portion at one end and aprojecting portion, at its opposite end extending alongside of saidelement, and arig'id connecting member formed of sections recessed attheir end portions to form, together, openings for receiving saidelement and said projecting portion, and means clamping said sectionsagainst said element and said projecting portion.

JOHN T. HISCOCK.

